Electrical measuring instrument.



W. ANTHONY.

ELECTRICAL MEASURTNG INSTRUMENT.

APPLICATION FILED SEPT.5,1916.

1 ,273, 126. Patented July 23, 1918.

IN VEN 'T' UH WILLIAM ANTHONY, OF CLYDE, OHIO.

ELECTRICAL MEASURING INSTRUMENT.

companying drawings and to the characters of reference marked thereon, which form a part of this .specification.

This invention relates to electrical measuring instruments, and more particularly to ammeters of thepocket type. v

An object of my invention is to simplify and cheapen the construction of instruments of the character described by makin a,

body-frame and the coil and needle-hol ing spool in two separate pieces, whereby the I body-frame can be made of a chea'permaterial than the spool, and by providing simple and eflicient means for easily and quickly'- securing the frame and spooltogeth'er in a rigid, strong and durable manner.

A further ob ect of my invention isthe provision, on the coil-carrying spool, of improved needle pivot bearing means, which is capable of easy, quick andaccurate adjustment to facilitate the instrument assembling.

The invention is fully described in the following specification, and while, in its broader aspect, it is capable of embodiment in numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which I Figure 1 is a face view of an instrument embodying my invention. Fig. 2 is a face view of the invention, with the case removed. Figs. 3 and 4 are side and reariviews thereq of, res ectively. Fig. 5 is a perspective view 0 the body-frame and coil spool in separated relation, and Fig. 6 is a different perspective view of'the coil spool from that shown in Fig. 5, I

Referring .to the drawings, 1 designates the body-frame of the instrument, whlch 5 50 frame comprises a single piece stamped preferably from sheet steeland having its outer end of segmental form to conform to the circular side wall of the case 2in which it is mounted. The side edges of the frame, in the present instance, are inwardly inclined in converging relation and each has position to t Specification of Letters Patent. Patented July 23, 1918. Application filed September 5, 1916. Serial No. 118,497. I

an integral leg 3 projecting transversely therefrom to rest against'the front 'wall of the case 2 and space the frame therefrom. A pair of integral tongues 4 project forward from the 1nner end of the frame 1 in transversely spaced relation with respect to the frame and each is provided at its outer end with a longitudinally projecting spur 5 preferably disposed adjacent to ts inner edge. An integral tongue 6 is struck rearward from the central portion of the frame 1 and carries the magnet 7 at the rear of the frame in spaced relation thereto and with its poles projecting beyond the inner end of the frame, as shown.

A scale 8, over which the indicator needle travels, is mounted onthe front side of the frame 1 and is viewed exteriorly of the case '2 through a window 9 in the front thereof,

as is customary with instruments of this character.

- bet-ween the tongues 4, 4 of the frame 1 and are provided at their outer or free ends with outwardly projecting fingers 14, which are intended tobear. flat against the inner sides of the tongues4 to prevent an outward lonitudinal separation of the frame and spool. he spool legs are rigidly secured in this e tongues 4. by bending the spurs 5 inward .over the fingers 14 and at the outer sides thereof to firmly hold such fingers to the tongues, as shown in Fig, 3. It is evident that this provides a simple and eficient means for securing the frame and; spool in assembled relation. When the spurs 5 have been bent over into holding engagement with the fingers 14, the tongues 4 then form legs whichcoopgrate with the legs 3, 3 to support the frame lin spaced relation to the front of the case 2.

1 Each leg 12 of the-spool is preferably broadened at each side edge thereof between its inner end, and the finger 14, and these broadened portions are rounded inward so that the body portion of the leg on which the cqilis mounted is of segmental form in cross-section to facilitate a winding of the" coil thereon. v

The cross-piece 13 of the spool is preferably broader than the legs 12 to project transversely in both directions therefrom, and one edge of the cross-piece the front, in the present instance, is provided with an integral lug 15 projecting outward transversely therefrom and having a slight depression 16 in its' inner side to form the bearing for one end of the needle-pivot 17. The opposite side edge of the cross-piece 13, or that disposed, in the present mstance, adjacent to the front of the case, is provided with a U-shaped extension 18, the legs of which project forward and outward from the respective end portions of the cross-piece transversely thereof so that the looped por-' tion of theextension 18 is d1s osed over the bearing lug 15 in spaced re ation thereto and in position to form a pivot end bearmg in opposition to said bearing lug. For this purpose the inner side of the ooped portion ,of the extension 18 is rovided centrally thereof with a punch-mar 19 in axial relation to the punch-mark in the bearing lug 1,5, and for receiving the respective end of the. needle-pivot 17 The space between the bearing lug 15 and the loop or bearin portion of the extension 18 when turne outward in bearing position is greater than the length of the needle-pivot 1 to permit the placing of said pivot in proper position between said parts. This having been done, the looped portion of the extension 18 is forced inward for a portion of the length thereof between the legs of said extension so as to place the pivot bearing portion of such extension in proper bearing relation to the respective pivot end. The inward forcing of the central looped portion of the extension 19 in thismanner causes a stretching or drawing out of the metal composin the same so that the bearing portion of suc extension will remain permanently set in any position. to which it maybe drawn. This isfound in practice to provide an exceedingly sim le means for assembling the indicator nee les and s ools and is,.so far as I am aware, a consi erable improvement over the -method heretofore employed of mounting needle-pivots in the frames of instruments of this character. A suitable tool' isprovided'for drawing the bearing loop- 18 inward and enables a very accurate and close adju'stment'of the pivot. bearings to be obtained in an easy and rapid manner.

The cross-piece 13 is opening 20 I through wh1ch the indicator needle 21 projects into position to register. .with the scale 8. The armature 22, that is carried by the pivot 17 at one side of the needle 21, also has a turning movement into the opening 20.

The conductive coil '11, which is mounted on the spool 10, has one end connected to-a leg of the frame 1 andin electrical connection through said frame with a post 23,

rovided with an which projects from a la 24 at the outer end of the frame 1 throug the side wall of the case 2 and'carries a nut 25 for binding a lead 26 thereto, as is customary in instruments of this class. The other end of the coil 11 hasconnection, not shown, with a contact post 27, which is insulatingly carried by the case 2 in opposition to the post 23. It will, of course, be understood that the passage of a current through the coil 11 will act on the armature 22, and, if the current 'is sufficient, will influence a movement of said armature against the magnetic influence of the ma et 7 thereon.

I wish 1t understood that my invention'is not limited to any specific construction, arrangement or form of the parts, as it is capable of numerous modifications without departing from the spirit of the claims, 7

Havlng thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In an instrument of the class described, a magnet-carrying frame, and a coil-carry ing spool, said frame and s 001 havinginterengaging two together.

2. In an instrument of the class described,

tongues for rigldly securing the a magnet-carrying frame, a coil-carrying spool of U-form, said frame and spool having interengaging tongues for rigidly securingthe two together.

3. In an instrument of the class described, a magnet carrying frame, a coil and indicator needle carrymg frame of U form, and means for securing the le terminals of said latter frame to an edge 0 the magnet carrying frame.

4:. In an instrument of the class described, a magnet-carrying frame, and a member forming a coil-carrying spool and an indicator-needle carrying part, said frame and -member having interengaging tongues for rigidl securing the two together.

5. n an instrument of the class described,

a.magnetcarrying frame having spaced laterally projecting tongues at its inner end and a coil-carrying spool of U-form' having its legs adapted to fit between said tongues and outwardly bent at their ends to engage the inner sides of res ective ton es, said tongues having parts nt aroun the bent and portions of the'legs to firmly hold the same.

6. In an instrument of the class described, a magnet-carrying frame and a coil carrying spool, the latter 'of U-form, both having tongues transversely projecting. from their inner ends and interengaging to firmlyunite the two.

7. In an instrument of the class described, I

a coil carrying s 001 having a cross-piece at its outer end an needle-pivot bearings projecting outward from said cross-piece and one comprising a strip which is connected at its ends to longitudinally spaced portions of said cross-piece and capable of stretching when drawn intermediate its ends toward the other bearing.

8. In an instrument of the class described, a coil carrying spool of U-form having integral upper and lower needle-pivot bearings on its crown portion, with one of said bearings forming a strip extending lengthwise of the crown and connected at its ends thereto, said strip being capable of stretching and remaining permanently set when drawn intermediate its ends toward the other bearing.

9. In an instrument of the class described, a coil carrying spool having spaced legs on which a coil is wound and having a crosspiece connecting said legs at one end, said cross-piece having a bearing projecting outward from one side edge thereof and having a U-shaped bearing strip projecting outward from its opposite edge, with its legs connected to said cross-piece, said strip being adjustable to vary the space between it and said bearing and to cooperate therewith to carry a needle-pivot.

10. In an instrument of the class described, a coil carrying spool having spaced integral needle-pivot bearings at its outer end, with one bearing connected at both ends to said spool and capable of adjustment intermediate its ends toward and away from the other bearing.

11. In an instrument of the class described, a magnet carrying frame, a coil and indicator needle carrying frame, and means operable to engage said latter frame to the edge of the magnet carrying frame.

In testimony whereof, I have hereunto signed my name to this specification.

WILLIAM ANTHONY. 

